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objective-c下的NSString字符串操作  

2011-07-21 20:39:29|  分类: apple |  标签: |举报 |字号 订阅

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除去字符串末尾的空格

  1. NSString *ook = @"\n \t\t hello there \t\n  \n\n";  
  2. NSString *trimmed =  
  3.  [ook stringByTrimmingCharactersInSet:  
  4.  [NSCharacterSet whitespaceAndNewlineCharacterSet]];  
  5. NSLog(@"trimmed: '%@'", trimmed);

//1、创建常量字符串。
    NSString *astring = @"This is a String!";

//2、创建空字符串,给予赋值。

    NSString *astring = [[NSString alloc] init];
    astring = @"This is a String!";
    NSLog(@"astring:%@",astring);
  [astring release];

//3、在以上方法中,提升速度:initWithString方法

    NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];
    NSLog(@"astring:%@",astring);
    [astring release];

 //4、用标准c创建字符串:initWithCString方法

    char *Cstring = "This is a String!";
    NSString *astring = [[NSString alloc] initWithCString:Cstring];
    NSLog(@"astring:%@",astring);
    [astring release];

    //5、创建格式化字符串:占位符(由一个%加一个字符组成)

    int i = 1;
    int j = 2;
    NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"%d.This is %i string!",i,j]];
    NSLog(@"astring:%@",astring);
    [astring release];

    //6、创建临时字符串

    NSString *astring;
    astring = [NSString stringWithCString:"This is a temporary string"];
    NSLog(@"astring:%@",astring);


    NSString *path = @"astring.text";
    NSString *astring = [[NSString alloc] initWithContentsOfFile:path];
    NSLog(@"astring:%@",astring);
    [astring release];


    NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];
    NSLog(@"astring:%@",astring);
    NSString *path = @"astring.text";    
    [astring writeToFile: path atomically: YES];
    [astring release];

    //用C比较:strcmp函数

    char string1[] = "string!";
    char string2[] = "string!";
    if(strcmp(string1, string2) = = 0)
    {
        NSLog(@"1");
    }

   //isEqualToString方法    
    NSString *astring01 = @"This is a String!";
    NSString *astring02 = @"This is a String!";
    BOOL result = [astring01 isEqualToString:astring02];
    NSLog(@"result:%d",result);

   //compare方法(comparer返回的三种值)    
    NSString *astring01 = @"This is a String!";
    NSString *astring02 = @"This is a String!";    
    BOOL result = [astring01 compare:astring02] = = NSOrderedSame;    
    NSLog(@"result:%d",result);    


    //NSOrderedSame 判断两者内容是否相同

    NSString *astring01 = @"This is a String!";
    NSString *astring02 = @"this is a String!";
    BOOL result = [astring01 compare:astring02] = = NSOrderedAscending;    

    NSLog(@"result:%d",result);


    //NSOrderedAscending 判断两对象值的大小(按字母顺序进行比较,astring02大于astring01为真)

    NSString *astring01 = @"this is a String!";
    NSString *astring02 = @"This is a String!";
    BOOL result = [astring01 compare:astring02] = = NSOrderedDescending;    
    NSLog(@"result:%d",result);     


    //NSOrderedDescending 判断两对象值的大小(按字母顺序进行比较,astring02小于astring01为真)

//不考虑大 小写比较字符串1
    NSString *astring01 = @"this is a String!";
    NSString *astring02 = @"This is a String!";
    BOOL result = [astring01 caseInsensitiveCompare:astring02] = = NSOrderedSame;    
    NSLog(@"result:%d",result);     


    //NSOrderedDescending判断两对象值的大小(按字母顺序进行比较,astring02小于astring01为真)

//如何判断字符串为空

NSString *urlString = [urlInput stringValue];

 
if (!urlString) { 
 
 
NSLog( @”NO INPUT.” );

 
} else { 
 
if ([urlString length] == 0 ) {

 
NSLog( @”NO INPUT.” );

 
} else {

 
}

 

Convert NSString to int

1 NSString *aNumberString = @"123";
2 int i = [aNumberString intValue];

Convert int to NSString

1 int aNumber = 123;
2

NSString *aString = [NSString stringWithFormat:@"%d", aNumber];

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